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(c) give a semiconductor material specific properties. (d) protect devices from damage in case of transients. 10. A semiconductor material is made into N type by (a) adding an acceptor impurity. (b) adding a donor impurity. (c) injecting protons. (d) taking neutrons away. 11. Which of the following does not result from adding an acceptor impurity (a) The material becomes P type. (b) Current flows mainly in the form of holes. (c) Most of the carriers have positive electric charge. (d) The substance acquires an electron surplus. 12. In a P-type material, electrons are (a) the majority carriers. (b) the minority carriers. (c) positively charged. (d) entirely absent. 13. Holes move from (a) minus to plus. (b) plus to minus. (c) P-type to N-type material. (d) N-type to P-type material. 14. When a P-N junction does not conduct even though a voltage is applied, the junction is (a) reverse-biased at a voltage less than the avalanche voltage. (b) overdriven. (c) biased past the breaker voltage. (d) in a state of avalanche effect. 15. Holes flow the opposite way from electrons because (a) charge carriers flow continuously. (b) they have opposite electric charge. (c) they have the same electric charge. (d) Forget it! Holes flow in the same direction as electrons. 16. If an electron is considered to have a charge of 1 unit, then a hole can be considered to have (a) a charge of 1 unit. (b) no charge.
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324 Introduction to Semiconductors
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(c) a charge of +1 unit. (d) a charge that depends on the semiconductor type. 17. When a P-N junction is forward-biased, conduction will not occur unless (a) the applied voltage exceeds the forward breakover voltage. (b) the applied voltage is less than the forward breakover voltage. (c) the junction capacitance is high enough. (d) the depletion region is wide enough. 18. If the reverse bias exceeds the avalanche voltage in a P-N junction, (a) the junction will be destroyed. (b) the junction will insulate; no current will flow. (c) the junction will conduct current. (d) the capacitance will become extremely low. 19. Avalanche voltage is routinely exceeded when a P-N junction acts as a (a) current rectifier. (b) variable resistor. (c) variable capacitor. (d) voltage regulator. 20. Which of the following does not affect the junction capacitance of a diode (a) the cross-sectional area of the P-N junction (b) the width of the depletion region (c) the phase of an applied ac signal (d) the reverse-bias voltage
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CHAPTER
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IN THE EARLY YEARS OF ELECTRONICS, NEARLY ALL DIODES WERE VACUUM TUBES. TODAY, MOST ARE
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made from semiconductors. Contemporary diodes can do almost everything that the old ones could, and also some things that people in the tube era could only dream about.
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Rectification
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The hallmark of a rectifier diode is that it passes current in only one direction. This makes it useful for changing ac to dc. Generally speaking, when the cathode is negative with respect to the anode, current flows; when the cathode is positive relative to the anode, there is no current. The constraints on this behavior are the forward breakover and avalanche voltages, as you learned about in Chap. 19. Examine the circuit shown at A in Fig. 20-1. Suppose a 60-Hz ac sine wave is applied to the input. During half the cycle, the diode conducts, and during the other half, it doesn t. This cuts off half of every cycle. Depending on which way the diode is hooked up, either the positive half or the negative half of the ac cycle will be removed. Drawing B in Fig. 20-1 shows a graph of the output
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20-1 At A, a half-wave rectifier circuit. At B, the output of the circuit shown at A
when an ac sine wave is applied to the input. 325
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326 How Diodes Are Used
20-2 Schematic diagram of
a crystal-set radio receiver.
of the circuit at A. Remember that electrons flow from negative to positive, against the arrow in the diode symbol. The circuit and wave diagram of Fig. 20-1 show a half-wave rectifier circuit. This is the simplest possible rectifier. That s its chief advantage over other, more complicated rectifier circuits. You ll learn about the various types of rectifier diodes and circuits in Chap. 21.
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